| Frequency | Number of dividends |
| Annually | 0 |
| Semi-annually | 0 |
| Quarterly | 132 |
| Monthly | 0 |
| Irregularly | 0 |
| 'none' | 0 |
Dividend payment timing:
| Month | Number of dividends |
| January | 0 |
| February | 1 |
| March | 32 |
| April | 0 |
| May | 1 |
| June | 32 |
| July | 0 |
| August | 0 |
| September | 33 |
| October | 0 |
| November | 0 |
| December | 33 |
| Status | Number |
| Cancelled | 0 |
| Discontinued | 0 |
| Omitted | 0 |
| Year | Dividends paid | Increase from previous year | CAGR to 2012 from | Bumpiness to 2012 from |
| 1980 | $ 0.12500 | 7.253% | 12 | |
| 1981 | $ 0.18750 | 50.000% | 6.099% | 9 |
| 1982 | $ 0.25000 | 33.333% | 5.294% | 8 |
| 1983 | $ 0.25000 | NO CHANGE | 5.481% | 8 |
| 1984 | $ 0.25000 | NO CHANGE | 5.683% | 8 |
| 1985 | $ 0.25000 | NO CHANGE | 5.899% | 8 |
| 1986 | $ 0.25000 | NO CHANGE | 6.133% | 8 |
| 1987 | $ 0.25000 | NO CHANGE | 6.386% | 8 |
| 1988 | $ 0.25000 | NO CHANGE | 6.661% | 8 |
| 1989 | $ 0.25000 | NO CHANGE | 6.960% | 8 |
| 1990 | $ 0.25000 | NO CHANGE | 7.288% | 8 |
| 1991 | $ 0.30000 | 20.000% | 6.717% | 8 |
| 1992 | $ 0.30000 | NO CHANGE | 7.065% | 8 |
| 1993 | $ 0.31250 | 4.167% | 7.219% | 8 |
| 1994 | $ 0.32500 | 4.000% | 7.401% | 9 |
| 1995 | $ 0.32500 | NO CHANGE | 7.853% | 9 |
| 1996 | $ 0.32500 | NO CHANGE | 8.364% | 9 |
| 1997 | $ 0.33750 | 3.846% | 8.672% | 9 |
| 1998 | $ 0.35000 | 3.704% | 9.036% | 9 |
| 1999 | $ 0.35000 | NO CHANGE | 9.764% | 9 |
| 2000 | $ 0.36250 | 3.571% | 10.296% | 9 |
| 2001 | $ 0.37500 | 3.448% | 10.941% | 9 |
| 2002 | $ 0.38750 | 3.333% | 11.732% | 9 |
| 2003 | $ 0.40000 | 3.226% | 12.719% | 9 |
| 2004 | $ 0.42500 | 6.250% | 13.555% | 10 |
| 2005 | $ 0.45000 | 5.882% | 14.696% | 10 |
| 2006 | $ 0.52500 | 16.667% | 14.370% | 11 |
| 2007 | $ 0.67500 | 28.571% | 11.724% | 9 |
| 2008 | $ 0.87500 | 29.630% | 7.648% | 4 |
| 2009 | $ 1.00000 | 14.286% | 5.523% | 1 |
| 2010 | $ 1.05000 | 5.000% | 5.785% | 1 |
| 2011 | $ 1.10000 | 4.762% | 6.818% | 0 |
| 2012 | $ 1.17500 | 6.818% |
| Yield | Price |
| 0.5% | $235.00 |
| 1.0% | $117.50 |
| 1.5% | $ 78.33 |
| 2.0% | $ 58.75 |
| 2.5% | $ 47.00 |
| 3.0% | $ 39.17 |
| 3.5% | $ 33.57 |
| 4.0% | $ 29.38 |
| 4.5% | $ 26.11 |
| 5.0% | $ 23.50 |
| 5.5% | $ 21.36 |
| 6.0% | $ 19.58 |
| 6.5% | $ 18.08 |
| 7.0% | $ 16.79 |
| 7.5% | $ 15.67 |
| 8.0% | $ 14.69 |
| 8.5% | $ 13.82 |
| 9.0% | $ 13.06 |
| 9.5% | $ 12.37 |
| 10.0% | $ 11.75 |